An Insightful Joke

I recently picked a new primary care physician. After two visits and exhaustive lab tests, he said I was doing "fairly well" for my age. A little concerned about that comment, I couldn't resist asking him, "Do you think I'll live to be 80?" He asked, "Do you smoke tobacco or drink beer/wine?" "Oh no," I replied. "I'm not doing either." Then he asked, "Do you eat rib-eye steaks and barbecued ribs?" I said, "No, my other Doctor said that all red meat is very unhealthy!" "Do you spend a lot of time in the sun, like playing golf, sailing, hiking, or bicycling?" "No, I don't," I said. He asked, "Do you gamble, drive fast cars, or have a lot of sex?" "No," I said. "I don't do any of those things." He looked at me and said, "Then why do you give a shit if you live to be 80?"